Function svec_svec_angle

methods/svec_util/src/pg_gp/svec_util.c:506–531

* svec_svec_angle - Computes the angle between two SVECs. */

 *  svec_svec_angle - Computes the angle between two SVECs.
 */
Datum svec_svec_angle(PG_FUNCTION_ARGS)
{
	SvecType *svec1 = PG_GETARG_SVECTYPE_P(0);
	SvecType *svec2 = PG_GETARG_SVECTYPE_P(1);
	SparseData left  = sdata_from_svec(svec1);
	SparseData right = sdata_from_svec(svec2);
	double dot, m1, m2, result;

	dot = svec_svec_dot_product( svec1, svec2);

	m1 = l2norm_sdata_values_double(left);
	m2 = l2norm_sdata_values_double(right);

	if (IS_NVP(dot) || IS_NVP(m1) || IS_NVP(m2)) PG_RETURN_NULL();

	result = dot/(m1*m2);

	if (result > 1.0) {
		result = 1.0;
	}
	else if (result < -1.0) {
		result = -1.0;
	}

	PG_RETURN_FLOAT8(acos(result));
}

PG_FUNCTION_INFO_V1( svec_svec_tanimoto_distance );
/**